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Tomcat seems to throw 404 errors every second request when accessing dynamically generated files

Posted on 2010-11-25
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Last Modified: 2012-05-10
We have set up an environment in which exists 2 web servers.

Server 1 - Tomcat Server serving a Java host application.
Server 2 - IIS web server serving a proprietary application via web services

The issue we're having is as follows:

When a specific call is made to a particular web method on Server 2 it generates an html file and associated images on a shared drive. This in itself works fine.

This shared drive is permanently mapped as a virtual directory in Tomcat on Server 1, so that images related to the html page can be retrieved via Server 1 rather than requiring direct access to Server 2.

When the first request is made to retrieve the images, the html and images show fine.
However on subsequent requests Tomcat throws a 404. It then takes a few seconds to untangle itself, then 1 further request will work, followed by a string of 404s.

The individual http requests are completely independent requests for different urls (as the files being requested are dynamically generated with different names each time), and logging shows these files do exist on the drive before Tomcat requests the file to read and stream back.

We believe the problem lies with Tomcat although it's possible something else is going on.
Caching is disabled on the virtual directory.

Any help would be very much appreciated.
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Question by:capsoftuk
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BigRat earned 500 total points
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I presume that the images are being created by IIS and are to be retrieved by Apache/TomCat?

It would seem to me that the directory pages of the image directory is being buffered in TomCat or the platform on which it runs. Thus it will randomly give a "file not found" response.

Are the platforms the same, or is this a Linux/Windows environment?
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by:capsoftuk
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